A222567 - cp's OEIS frontend

A222567 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.

n	a(n)
1	1
2	1
3	5
4	18
5	59
6	200
7	820
8	3014
9	11364
10	42748
11	164652
12	627034
13	2399454
14	9229494
15	35487202
16	137093302
17	528389870
18	2048668614
19	7920616338
20	30777407006
21	119302534874
22	464420087686
23	1804371752146
24	7034061387558
25	27382292281570

[1, 1, 5, 18, 59, 200, 820, 3014, 11364, 42748, 164652, 627034, 2399454, 9229494, 35487202, 137093302, 528389870, 2048668614, 7920616338, 30777407006, 119302534874, 464420087686, 1804371752146, 7034061387558, 27382292281570]

cp's OEIS Frontend

A222567 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order.

Table of values

List of values